The mean of a set of 30 observations is 75 .

Question:

The mean of a set of 30 observations is 75 . If each observation is multiplied by a non-zero number $\lambda$ and then each of them is decreased by 25 , their mean remains the same. Then $\lambda$ is equal to

  1. $\frac{2}{3}$

  2. $\frac{10}{3}$

  3. $\frac{1}{3}$

  4. $\frac{4}{3}$


Correct Option: , 4

Solution:

Solution not requierd

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